cob_extern: 0.6.0-0 in 'indigo/distribution.yaml' [bloom]

Increasing version of package(s) in repository `cob_extern` to `0.6.0-0`:

- upstream repository: https://github.com/ipa320/cob_extern.git
- release repository: https://github.com/ipa320/cob_extern-release.git
- distro file: `indigo/distribution.yaml`
- bloom version: `0.5.11`
- previous version for package: `0.5.3-0`

## cob_extern

- No changes

## libntcan

- No changes

## libpcan

- No changes

## libphidgets

- No changes